checking pkg-config is at least version 0.9.0... yes checking for gtkdoc-check... /usr/bin/gtkdoc-check checking for gtkdoc-rebase... /usr/bin/gtkdoc-rebase checking for gtkdoc-mkpdf... /usr/bin/gtkdoc-mkpdf configure: error: You need to have gtk-doc >= 1.18 installed to build systemd saving you the rest as it seems like udev just needs that one dependency added seems to compile fine with 1.18
This is fixed; thanks for the report.